Portion of letter tray



FIG. 1 is a top perspective view of a portion of letter tray showing mynew design;

FIG. 2 is a front, perspective view thereof;

FIG. 3 is a rear, perspective view thereof;

FIG. 4 is a right side view thereof, the left side view being a mirrorimage; and,

FIG. 5 is a top, perspective view thereof.

The broken lines in the drawings form no part of the claimed design. Thejagged broken lines in the drawings form no part of the claimed designand the subject matter between such jagged lines is broken away todisclose indeterminate length.

The ornamental design for a portion of letter tray, as shown anddescribed.